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Re: Utilities for keeping time sync for a machine behind a firewall ?



Shaul Karl (shaulk@israsrv.net.il) wrote:

> I am behind a firewall.
> What utilities are there that will let me keep the time synchronized with 
> another machine on the Internet ?

Ouch.  Your best bet would be to ask your firewall administrator to
synchronize the firewall with NTP, and then to synchronize your machine
to the firewall.

If, as is often the case, your firewall admin is too boneheaded (or has
his/her hands tied by management), then you're out of luck.  Maybe some
other machine inside the firewall could be used as a time source.

If time synchronization is really important (e.g., if you want to sync
a server, not just your desktop box), then you might be able to put
pressure on the firewall admins from above by presenting a business
case for implementing time synchronization on the server.  Or if you
can actually get a (*gasp*) budget, then you might be able to invest in
a radio clock, GPS or similar hardware to bypass the firewall.

I think the Usenet group for all of this is comp.protocols.time.ntp.


Paul McHale (pmchale@doubleesolutions.com) wrote:

> I added the following command to my root crontab (type: crontab -e):
> 
> 1  0   * * *   /usr/sbin/rdate ntp2.usno.navy.mil >> $HOME/tmp/out 2>&1

Which is great if you can *talk to* ntp2.usno.navy.mil.


Patrick Kirk (patrick@kirks.net) wrote:

> xntp3 is excellent.  Just type apt-get install xntp3 and it will take you
> through configuration.  If you need a server, try salmon.math.tcd.ie and
> sundial.columbia.edu

Which is great if you can *talk to* salmon.math.tcd.ie or ....

-- 
Greg Wooledge                    | "Truth belongs to everybody."
wooledge@kellnet.com             |   Red Hot Chili Peppers,
http://www.kellnet.com/wooledge/ |

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